[mao]

hi,i have a question on dynamic mesh in cfx. now i can use mesh motion to surfaces, but that means i have to stop when the mesh quality below a level. now i have a idea that if i can move nodes in calculating period, which implies nodes also moving based on a given law so that mesh quality will be ensured. unfortunately, i have no idea about how to set mesh nodes moving, hopeu can give me some suggestions. thank you very much.
faithfully
xiuli

[ghorrocks]

Mesh motion in CFX uses the motion of the boundary nodes to define a diffusion based algorithm to determine the motion of the internal nodes.

So the internal nodes already move in an attempt to improve the mesh quality.

[mao]

good afternoon,horrocks,thanks for your kind reply.i understand what u mean,now i have a way to move nodes along blade line during the blade mesh rotating around its axis, in the other words, i have the way how to make nodes move.unfortunately, i can only find mesh motion settings to boundary rather than nodes.can u give me some suggestions?

[PeMo]

Beside the displacement diffusion, Glenn mentioned, you have also the possibilty to define the movement of internal nodes with a junction box routine (check the manual for further information).
But I would stay with the already implemented functionality and if you have trouble to maintain the mesh quality try to play around with the stiffness parameter of the model

[ghorrocks]

For additional control on the interior nodes you can:
* Use a junction box routine as Peter mentioned
* Specify a sub domain and define the mesh motion of the nodes in the sub domain
* Adjust the displacement diffusion parameters to control how the displacement is diffused through the mesh